. Elementary lessons in the physics of agriculture . har- Fig. 60. 209. The Harrow.— As implements of tillage, rows are used to secure several quite distinct ends: 1. To produce a shallow seed-bed. 2. To dry the soil preparatory to seeding. 3. To render the surface of the ground more even. 4. To pulverize the soil and secure a more even texture. 5. To cover seed. 6. To destroy young weeds, 7. To work manure into the surface soil. 8. To aerate the soil. 9. To check evaporation by developing a soil-mulch. According as one or another of these ends is to be se- cured, the character of the harrow s
. Elementary lessons in the physics of agriculture . har- Fig. 60. 209. The Harrow.— As implements of tillage, rows are used to secure several quite distinct ends: 1. To produce a shallow seed-bed. 2. To dry the soil preparatory to seeding. 3. To render the surface of the ground more even. 4. To pulverize the soil and secure a more even texture. 5. To cover seed. 6. To destroy young weeds, 7. To work manure into the surface soil. 8. To aerate the soil. 9. To check evaporation by developing a soil-mulch. According as one or another of these ends is to be se- cured, the character of the harrow should be different. In Figs. 61, 62 and 63 are represented three of the strongly marked types of harrows, 210. The Disc Harrow.— This harrow, Fig. 61, is distinctly a seed-bed-preparing and soil-drying tool and, in its adjustable types, may be made to work to a remark- able depth in fall plowing and in corn ground in the spring. An immense amount of work can be done with it where there is the necessary power to move it, which, al- though large when running deep, is really small when compared with the amount of soil moved. Its rolling, concave, thin discs, when set obliquely, enable it to enter
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Keywords: ., bookcentury1800, bookcontributorthe, bookdecade1890, bookyear1891
